Tank was merged into one piece. Armature was updated to take place of "Separate Mesh Pieces" for animation.

Animation was added to bones.

Shape Keys were also merged, however this restricted the ease of using Shape keys and limits what can be achieved through mecanim without having to re animate tracks. This also would require adding more bone density to the model for the wheels for multiple movement variations of turning and going backwards. It is possible but as far as my conversation with James, this probably is not important to implement at this stage.

Model worked fine in Blender. When imported into Unity there seemed to be an issue with the Turret bone inheriting rotation of its parented Root bone. This caused a mess in Unity and made extremely difficult to animate the turret as it no longer rotated proper around the Y axis. Tried many things to fix this and finally got a few working solutions.